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Finding the Fourth Proportional to 125.15, 172.68 and 69.88

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Solution

The fourth proportional to 125.15, 172.68 and 69.88 is: 96.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    125.15 : 172.68 = 69.88 : x
  2. Step 2: Convert to fraction form
    125.15/172.68 = 69.88/x
  3. Step 3: Cross multiply
    125.15x = 172.68 × 69.88
  4. Step 4: Simplify right side
    125.15x = 12,066.71
  5. Step 5: Solve for x
    x = 12,066.71/125.15
  6. Step 6: Final answer
    x = 96.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.